Synthesis and thermal properties of rigid oxa-bridged-containing dimers and tetramers

Khan, Faiz Ahmed and Parasuraman, K and Donnio, B (2010) Synthesis and thermal properties of rigid oxa-bridged-containing dimers and tetramers. Tetrahedron, 66 (45). pp. 8745-8755. ISSN 0040-4020

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Abstract

Several symmetrical, linear dimers and some star-like tetramers were prepared using easily accessible oxa-bridged derivatives as central rigid cores. In order to produce new liquid crystalline materials various mesogenic/promesogenic groups, containing biphenyl-4,4′-diol, 4,4′-(diazene-1,2-diyl)diphenol and cholesterol sub-moieties, were connected through oxy-ethylene linkers via an ester linkage, in the end-on fashion. Their thermal behaviour and mesomorphic properties were investigated by differential scanning calorimetry (DSC), polarized optical microscope (POM), and variable temperature small-angle X-ray diffraction (XRD) methods. While essentially all the biphenyl-4,4′-diol- and 4,4′-(diazene-1,2-diyl)- based dimeric derivatives exhibited smectic liquid crystalline mesophases, the nature of which are mesogenic groups dependent, none of the cholesterol- containing compounds and tetramers were mesomorphic.

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IITH Creators:
IITH CreatorsORCiD
Khan, Faiz AhmedUNSPECIFIED
Item Type: Article
Uncontrolled Keywords: acetic acid derivative; biphenyl derivative; cholesterol; decanoic acid derivative; dimer; ethylene; phenol derivative; tetramer; unclassified drug
Subjects: Chemistry
Divisions: Department of Chemistry
Depositing User: Mr. Siva Shankar K
Date Deposited: 13 Oct 2014 05:02
Last Modified: 21 Sep 2017 06:48
URI: http://raiith.iith.ac.in/id/eprint/200
Publisher URL: https://doi.org/10.1016/j.tet.2010.09.003
OA policy: http://www.sherpa.ac.uk/romeo/issn/0040-4020/
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